1 files changed, 115 insertions, 0 deletions
diff --git a/src/pcm/Interleave.cxx b/src/pcm/Interleave.cxx
new file mode 100644
index 000000000..ed9fc125d
--- /dev/null
+++ b/src/pcm/Interleave.cxx
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Interleave.hxx"
+
+#include <string.h>
+
+static void
+GenericPcmInterleave(uint8_t *gcc_restrict dest,
+		     ConstBuffer<const uint8_t *> src,
+		     size_t n_frames, size_t sample_size)
+{
+	for (size_t frame = 0; frame < n_frames; ++frame) {
+		for (size_t channel = 0; channel < src.size; ++channel) {
+			memcpy(dest, src[channel] + frame * sample_size,
+			       sample_size);
+			dest += sample_size;
+		}
+	}
+}
+
+template<typename T>
+static void
+PcmInterleaveStereo(T *gcc_restrict dest,
+		    const T *gcc_restrict src1,
+		    const T *gcc_restrict src2,
+		    size_t n_frames)
+{
+	for (size_t i = 0; i != n_frames; ++i) {
+		*dest++ = *src1++;
+		*dest++ = *src2++;
+	}
+}
+
+template<typename T>
+static void
+PcmInterleaveT(T *gcc_restrict dest,
+	       const ConstBuffer<const T *> src,
+	       size_t n_frames)
+{
+	switch (src.size) {
+	case 2:
+		PcmInterleaveStereo(dest, src[0], src[1], n_frames);
+		return;
+	}
+
+	for (const auto *s : src) {
+		auto *d = dest++;
+
+		for (const auto *const s_end = s + n_frames;
+		     s != s_end; ++s, d += src.size)
+			*d = *s;
+	}
+}
+
+static void
+PcmInterleave16(int16_t *gcc_restrict dest,
+		const ConstBuffer<const int16_t *> src,
+		size_t n_frames)
+{
+	PcmInterleaveT(dest, src, n_frames);
+}
+
+void
+PcmInterleave32(int32_t *gcc_restrict dest,
+		const ConstBuffer<const int32_t *> src,
+		size_t n_frames)
+{
+	PcmInterleaveT(dest, src, n_frames);
+}
+
+void
+PcmInterleave(void *gcc_restrict dest,
+	      ConstBuffer<const void *> src,
+	      size_t n_frames, size_t sample_size)
+{
+	switch (sample_size) {
+	case 2:
+		PcmInterleave16((int16_t *)dest,
+				ConstBuffer<const int16_t *>((const int16_t *const*)src.data,
+							     src.size),
+				n_frames);
+		break;
+
+	case 4:
+		PcmInterleave32((int32_t *)dest,
+				ConstBuffer<const int32_t *>((const int32_t *const*)src.data,
+							     src.size),
+				n_frames);
+		break;
+
+	default:
+		GenericPcmInterleave((uint8_t *)dest,
+				     ConstBuffer<const uint8_t *>((const uint8_t *const*)src.data,
+								  src.size),
+				     n_frames, sample_size);
+	}
+}